A sensor arrangement includes a reaction subassembly having a housing and a detector subassembly. The housing is a layered component arrangement encompassing a luminophore-containing reaction laminate excitable, by irradiation with a first electromagnetic radiation of a first wavelength, to emit a second electromagnetic radiation of a second wavelength different from the first wavelength; and a temperature-detection laminate emitting an infrared radiation. The housing includes an opening for introducing a fluid, a reaction window and a temperature-sensing window. The reaction window transmits the first and second electromagnetic radiation, and the temperature-sensing window is penetrable by infrared radiation. The detector subassembly encompasses a radiation source emitting the first electromagnetic radiation, a radiation detector detecting the second electromagnetic radiation, and an infrared detector detecting, through the temperature detection window, the infrared radiation emitted from the temperature detection laminate. The reaction laminate and the temperature-detection laminate are embodied separately.